Note 2017:

For technical reasons it has not proved possible to format the original MS Word documents so that the printed version follows page by page the version submitted to the University of Copenhagen in 1990. That version was printed on a (then) state of the art high-end laser printer that used proprietary soft fonts. Since the printed version would thus necessarily differ in collation from the original, I took the opportunity, when I needed to print out the thesis in 1992, to correct a few typographical errors and re-insert a couple of lines in the introduction that had somehow been deleted. I also then fixed one quite minor factual error, but I no longer recall what this was. However, with that single exception, the thesis as offered here differs from the original only in the very occasional change of a phrase or correction of a typographical mistake. If any reader should need to quote from the thesis in a publication, please contact me at henrikthiil@gmail.com and I will supply the original reading and page reference. I plan to scan and upload the original version.

On request I changed the format to PDF. I hope page breaks are still as in the original MS Word document.